After a natural miscarriage, pathological tests can be performed on the embryonic tissue. The main purposes of these tests include the following two aspects: First, to check if the chorionic villi in the embryonic tissue are edematous or if it is a hydatidiform mole. In cases of natural miscarriage, if it is a hydatidiform mole, it is necessary to determine whether it is a benign or malignant hydatidiform mole. If it is not a hydatidiform mole, it can be treated as a regular miscarriage. Secondly, testing the embryo can clarify the reasons for the miscarriage, such as checking the chromosomes of the embryo to determine if there are any issues with the chromosomes, which can be informative for the next pregnancy.